631944479 has 2 divisors, whose sum is σ = 631944480. Its totient is φ = 631944478.

The previous prime is 631944431. The next prime is 631944491. The reversal of 631944479 is 974449136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631944479 - 2¹² = 631940383 is a prime.

It is a super-3 number, since 3×631944479³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631944409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315972239 + 315972240.

It is an arithmetic number, because the mean of its divisors is an integer number (315972240).

Almost surely, 2^631944479 is an apocalyptic number.

631944479 is a deficient number, since it is larger than the sum of its proper divisors (1).

631944479 is an equidigital number, since it uses as much as digits as its factorization.

631944479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The square root of 631944479 is about 25138.5059023006. The cubic root of 631944479 is about 858.1429547377.

The spelling of 631944479 in words is "six hundred thirty-one million, nine hundred forty-four thousand, four hundred seventy-nine".